new description for the options of identify tool (settings > options > Map tools)
Merge pull request #299 from andremano/master

new description for the options of identify tool (settings > options > M...
added 4 icons for colorpicker + changed conf.py
added 4 icons colorpicer to substitions section of documentation guidelines
Merge branch 'master' of https://github.com/diethard2/QGIS-Documentation